Rolling stand



Jan. 30, 1968 s. JOHNSSON 3,365,925

ROLLING STAND Filed May 7, 1963 5 Sheets-Sheet 1 INVENTOR. 5773 j lwss o/V Jan. 30, 1968 s. JOHNSSON 3,365,925

' ROLLING STAND Filed May 7, 1963 5 Sheets-Sheet 2 IN VENTOR.

Sch/550M Jan. 30, 1968 s. JOHNSSON 3,365,925

ROLLING STAND Filed May 7, 1963 5 Sheets-Sheet s m/nsA/m/P .5776 JOf/A/5SO/V,

United States Patent 3,365,925 ROLLING STAND Stig Johnsson, Vasteras, Sweden, assignor to Allmanna Svenska Elektriska Airtieholaget, Vasteras, Sweden, a Swedish corporation Filed May 7, 1963, Ser. No. 278,716

Claims priority, application Sweden, May 10, 1962,

13 Claims. (Cl. 72-237) The present invention relates to a rolling mill and a frame therefor consisting essentially of two yoke members and at least two spacer elements between the yoke members, which parts are held together under prestressing.

In a rolling stand the frame of which is composed of several parts it is known that these parts must be joined together under strong prestressing so that play does not occur between them when the rolling stand is loaded during rolling. In order to produce the desired prestress in rolling stands bolts are used as these are relatively cheap and easy to apply. The use of bolts is the method most used in the technique for producing prestressing. Other prestressing methods are known, some of them used only under very special conditions.

The present invention comprises one of these other prestressing methods used on rolling mill frames consist essentially of two yoke members separated by spacer elements. According to the invention the prestressing means is arranged in the form of strip loops wound under prestress and forming a casing around yoke members and spacer elements and between the yoke members supports for two or more rolls are arranged.

The object of the invention is to obtain rolling frames with relatively small outer dimensions which can be loaded with very large rolling pressure so that it is possible to go over to higher rolling pressure than is now usual. The elongation of the rolling frames during loading constitutes a difficult problem in rolling, but the invention makes it possible for the rolling pressure in many cases to be increased by up to five times without the elongation in the rolling stand becoming greater than for rolling stands of conventional type.

In order to enable regulation of the width of the roll space suitable adjustment means can be arranged between the rolling frame yoke members. It is then suitable to arrange a means for coarse adjustment, for example a wedge device, a hydraulic cylinder or the like, and another means for fine adjustment, for example a screw arrangement, the length of which may be regulated with the help of peripheral operating devices. As an example of such a screw device can be mentioned a fixed screw with a ring-shaped nut which lies close against one roll support and which may be turned round with the help of radial operating rods connected or connectable at the periphery.

The spacer elements between the rolling frame yoke members are suitably made as two columns. Between columns and yoke members, however, substantially discshaped distance pieces can be placed, which if they are provided with suitable projections offer an easily accessible bracket for the side supports of the rolling stand. Such projections can also be formed to carry the rolling stand and to fix it to its base. Further the distance pieces could act as brackets or bases for the regulating devices for the width of the roll space and in addition offer possibilities of evening the stress at the supporting surfaces of the columns, at the outer edge of which stress concentrations arise if some form of recess is not provided. It is easier to arrange such recesses on the distance pieces than on the columns, because the contact surfaces of the distance pieces can be made somewhat higher in relation to the main part of the distance pieces, whereas on the other hand the columns must be provided with projections in order to effect a suitable transfer at the outer edge of the supporting surfaces, which is usually more expensive.

Side supports or similar arrangements for propping up the rolling frame may also be attached direct to the columns or yoke members, for example to flanges which are arranged on both sides of the wire casing.

The support blocks of the rolls may be guided directly by the columns, but with long columns and heavy loading such a roll support may be less satisfactory. When the rolling frame is loaded the columns will in fact bend so that either pinching or too much play occurs between the columns and the roll support blocks. A more reliable control is however attained if the rolling frame according to the invention is provided with side plates guiding the roll support and joined with bolts to the yoke members so that the attachment permits vertical movements at the one yoke member. These side plates then in fact will be deformed not at all or only slightly at high rolling pressure. The side plates can also be provided with brackets arranged to carry or support the rolling frame in relation to the mounting. The construction of the rolling frame may otherwise be freely varied as described above irrespective of whether or not side plates are used.

The invention is illustrated more fully below with reference to accompanying figures which schematic-ally show different embodiments of the invention. FIGURE 1 shows a rolling frame according to the invention seen in the direction of the rolls. FIGURE 2 shows a detail of the section A-A in FIGURE 1. FIGURES 3, 4 and 5 show schematically different embodiments of a rolling frame according to the invention. FIGURE 6 shows a rolling mill formed by such frames.

In the figures, 1 indicates the axle journal of the rolls, 2 the roll support blocks, 3 the rolling frame yoke members, 4 spacer elements or columns situated between the yoke members, and 5 the prestressed wire or strip casing which holds together the main parts of the rolling stand. In FIGURE 1 is shown how the roll supports 2 may be guided by the columns 4. Devices for adjusting the roll space are shown schematically at 6 and 7. The number 6 indicates a device for coarse adjustment and number 7 a threaded nut for fine adjustment. The device 6 may be a wedge device or alternatively a hydraulic cylinder or other suitable means. At the periphery on the nut 7, holes 8 are situated, in which an operating rod may be inserted for turning of the nut or possibly be permanently fixed. The nut turns on. a fixed screw 9 which is attached to the upper yoke member 3. The rolling stand is supported by longitudinal beams 10, which by means of bolts 11 are attached to the lower yoke member. The rolling frame is in addition supported in the rolling direction by side supports 12, which are attached to the columns 4 and the beams 10. Possibly the beams 10 could be omitted and the rolling frame supported only by the side supports 12.

A method of joining the side supports 12 with the columns 4 is shown in FIGURE 2 which shows a cross section A-A of the column 4. As is seen the column 4 according to the invention where fiat distance pieces 16 and 18 have been arranged between the yoke member 3 and the columns 4. The projections 17 of the distance piece extend on the side of the wire casing 5 for attach ment of lateral support members and the middle part of the upper distance piece 16 supports the regulating screw 9. A regulating nut, not shown, turns on the screw 9 in the same way as in FIGURE 1. The lower distance piece 18 supports the rolling frame and is attached by means of mounting bolts 19 to the mounting 20. Side supports 12 may be situated between the distance pieces 16 and 18.

FIGURE 4 shows, schematically, a rolling frame according to the invention supplied with side plates 22 for guiding of the roller support blocks 2. The side plates are firmly attached at the lower yoke member with a bolt 23. In the upper yoke member is a corresponding bolt 24, but vertical movements between the yoke member and the side plates are here possible as the bolt is engaged by a hole oblong in the vertical direction in the side plates. The support blocks 2 are guided by the narrow sides 26 of the side plates. The side plates may be provided with brackets 27 engaging against the mounting 20, which brackets support or carry the rolling frame. The side plates may also act as side flanges for the prestressed wire or strip casing 5, whereby the shape of the yoke members and the columns may be considerably simplified.

FIGURE 5 shows a rolling frame according to the invention provided with a mill screw 21 of conventional type for regulating the roller space. The prestressed wire casing is here divided into two halves 5a and 5b, the winding planes of which are parallel with the longitudinal axes of the rolls. It is of course possible also with a divided wire casing to maintain the same direction of the winding plane as in the FIGURES 1, 3 and 4 if the space in the axial direction of the rolls is sufficient.

FIGURE 6 shows a rolling mill formed by two frames as shown in FIGURE 1 with rolls 1 extending between them.

The invention is not limited to the embodiments shown. A roll or frame which carries both end supports of a roll set may of course be made with common yoke members for both the halves of the stand or also for example only the upper or the lower yoke member may be common and extend along the whole length of the rollers, without any deviation from the inventive idea being made. In principle, several variations and embodiments are feasible within the scope of the following claims.

What is claimed is:

1. Rolling mill comprising two rolling frames, each frame comprising at least two yoke members separated by at least two spacer elements, prestressing means comprising strip loops surrounding said yoke members and spacer elements, roll support means for at least two rolls arranged between said yoke members and between said spacer elements, and rolls rotatably mounted in said roll support means and extending between said rolling frames.

2. Rolling mill as claimed in claim 1, having, between a yoke member and the roll support means for at least one of the rolls, means for regulating the roll space.

3. Rolling mill as claimed in claim 1, having, between a yoke member and the roll support means for at least one of the rolls, means for coarse adjustment and means for fine adjustment of the roll space.

4. Rolling mill as claimed in claim 1 having side supports connected to the spacer elements.

5. Rolling mill as claimed in claim 1, said prestressing means comprising at least two separated groups of strip loops.

6. Rolling mill as claimed in claim 5, a mill screw for regulating the roll space positioned between said separated groups.

7. Rolling mill as claimed in claim 5, in which the winding plane for both groups of strip loops is substantially parallel to the longitudinal axes of the rolls.

8. Rolling mill as claimed in claim 1, in which a substantially flat distance piece is placed between said spacer elements and at least one yoke member.

9. Rolling mill as claimed in claim 8, said distance piece being provided with projections extending outside said yokes for attachment of lateral support members.

10. Rolling mill as claimed in claim 8, said distance piece being provided with projections extending outside said yokes and forming support means for supporting the rolling frame.

11. Rolling mill as claimed in claim 1, said roll support means and spacer elements having cooperating means thereon guiding said roll support means.

12. Rolling mill as claimed in claim 1, side plates attached to the yoke members for guiding said roll support means.

13. Rolling mill as claimed in claim 12, in which the attachment between said side plates and one of the yoke members includes means to permit relative movement therebetween in a vertical direction.

References Cited UNITED STATES PATENTS 2,005,168 6/1935 Rose 72--246 3,064,558 11/1962 Von Platen 100214 3,130,628 4/1964 Blinn 85-1 3,217,525 11/1965 Howard 72237 RICHARD J. HERBST, Primary Examiner.

C. H. HITTSON, A. RUDERMAN, Assistant Examiners. 

1. ROLLING MILL COMPRISING TWO ROLLING FRAMES, EACH FRAME COMPRISING AT LEAST TWO YOKE MEMBERS SEPARATED BY AT LEAST TWO SPACER ELEMENTS, PRESTRESSING MEANS COMPRISING STRIP LOOPS SURROUNDING SAID YOKE MEMBERS AND SPACER ELEMENTS, ROLL SUPPORT MEANS FOR AT LEAST TWO ROLLS ARRANGED BETWEEN SAID YOKE MEMBERS AND BETWEEN SAID SPACER ELEMENTS, AND ROLLS ROTATABLY MOUNTED IN SAID ROLL SUPPORT MEANS AND EXTENDING BETWEEN SAID ROLLING FRAMES. 